Herbicides comprising benzoylcyclohexanediones and safeners

ABSTRACT

Herbicidal compositions are described that comprise active substances from the group of the benzoylcyclohexanediones and also safeners. These herbicidal compositions are especially suitable for use against weed plants in crop plant cultures.

The invention pertains to the technical field of crop protectants,especially herbicide/antidote combinations (active substance/safenercombinations) suitable for use against competing weed plants in cropplant cultures.

Numerous active herbicidal substances are known to be inhibitors of theenzyme p-hydroxyphenylpyruvate dioxygenase (HPPD). For instance, Proc.Br. Crop Prot. Conf. Weeds, 1991, 1, 51; Proc. Br. Crop Prot. Conf.Weeds, 1995, 1, 35 disclose benzoylcyclohexanediones, benzoylpyrazoles,and benzoylisoxazoles of this kind. More recently, further such activesubstances have been disclosed, for example, in WO 00/21924 and WO01/07422.

As with many other active herbicidal substances, these HPPD inhibitorstoo are not always sufficiently compatible with (i.e., lack sufficientselectivity for) certain important crop plants, such as corn, rice orcereals, whereby imposing narrow limitations on their use. In somecrops, therefore, they cannot be used, or can be used only at such lowapplication rates that the desired broad herbicidal activity toward weedplants is not ensured. More particularly, many of these herbicides lackcomplete selectivity for weed plants in corn, rice, cereals, sugar cane,and certain other crops.

A known means for overcoming these disadvantages is to use activeherbicidal substances in combination with a substance known as a safeneror antidote. EP-A 0 943 240, WO 99/66795, and WO 00/30447, for example,describe various combinations of certain HPPD inhibitors with safeners.

A safener is a compound which eliminates or lessens the phytotoxicproperties of a herbicide toward crop plants without substantiallyreducing the herbicidal action toward weed plants.

Identifying a safener for a particular group of herbicides is still adifficult task, since the precise mechanisms by which a safener lessensthe noxious effect of herbicides are unknown. Consequently, the factthat a compound acts as safener in combination with one particularherbicide does not permit conclusions as to the safener action of such acompound with other groups of herbicides. In the use of safeners toprotect crop plants against herbicide damage, it has been found that thesafeners in many cases may still have certain disadvantages. Theseinclude the following:

-   -   the safener lessens the action of the herbicides toward the weed        plants;    -   the crop plant protecting properties are inadequate;    -   with a given herbicide, the spectrum of crop plants in which the        safener/herbicide combination is to be used is too small;    -   a sufficiently large number of herbicides cannot be combined        with a given safener.

It is an object of the present invention to provide further combinationsof herbicides from the group of the HPPD inhibitors with safeners thatare suitable for raising the selectivity of these herbicides withrespect to important crop plants.

Novel combinations have now been found of certain herbicides from thegroup of the HPPD inhibitors which carry selected substituents inposition 3 of the benzoyl moiety with numerous other compounds whichraise the selectivity of these herbicides with respect to important cropplants.

The invention accordingly provides a herbicidally active compositioncomprising

-   A) a herbicidally effective amount of one or more compounds of the    formula (I)    in which the symbols and indices have the following definitions:-   R¹ is nitro, amino, halogen, cyano, (C₁-C₄)-alkyl, (C₂-C₄)-alkenyl,    (C₂-C₄)-alkynyl, (C₁-C₄)-haloalkyl, (C₂-C₄)-haloalkenyl,    (C₂-C₄)-haloalkynyl, (C₁-C₄)-haloalkoxy, (C₁-C₄)-haloalkylthio,    (C₁-C₄)-alkoxycarbonyl, (C₁-C₄)-alkylsulfonyl,    (C₁-C₄)-alkylsulfinyl, (C₁-C₄)-alkylthio, (C₁-C₄)-alkoxy,    (C₁-C₄)-alkoxy-(C₁-C₄)-alkoxy, (C₁-C₄)-alkylcarbonyl,    (C₁-C₄)-alkylaminosulfonyl, (C₁-C₄)-dialkylaminosulfonyl,    (C₁-C₄)-alkylcarbamoyl, (C₁-C₄)-dialkylcarbamoyl,    (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl, (C₁-C₄)-alkylamino or    (C₁-C₄)-dialkylamino;-   R² is (C₁-C₄)-haloalkoxy-(C₁-C₄)-alkyl,    (C₁-C₄)-alkoxy-(C₁-C₄)-alkoxy-(C₁-C₄)-alkoxy-(C₁-C₄)-alkyl,    (C₃-C₆)-cycloalkoxy-(C₁-C₄)-alkyl,    (C₃-C₆)-cycloalkyl-(C₁-C₄)-alkoxy,    tetrahydrofuran-2-yl-methoxy-(C₁-C₄)-alkyl,    tetrahydrofuran-3-yl-methoxy-(C₁-C₄)-alkyl or a heterocyclic radical    from the group consisting of isoxazol-3-yl and    4,5-dihydroisoxazol-3-yl which is substituted by a radical from the    group consisting of cyanomethyl, ethoxymethyl and methoxymethyl;-   R³ is OR⁵, cyano, halogen, cyanato, thiocyanato, (C₁-C₄)-alkylthio,    (C₁-C₄)-alkylsulfinyl, (C₁-C₄)-alkylsulfonyl, (C₂-C₄)-alkenylthio,    (C₂-C₄)-alkenylsulfinyl, (C₂-C₄)-alkenylsulfonyl,    (C₂-C₄)-alkynylthio, (C₂-C₄)-alkynylsulfinyl,    (C₂-C₄)-alkynylsulfonyl, (C₁-C₄)-haloalkylthio,    (C₂-C₄)-haloalkenylthio, (C₂-C₄)-haloalkynylthio,    (C₁-C₄)-haloalkylsulfinyl, (C₂-C₄)-haloalkenylsulfinyl,    (C₂-C₄)-haloalkynylsulfinyl, (C₁-C₄)-haloalkylsulfonyl,    (C₂-C₄)-haloalkenylsulfonyl or (C₂-C₄)-haloalkynylsulfonyl;-   R⁴ is (C₁-C₄)-alkyl;-   R⁵ is hydrogen, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl or    (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl;-   a is 0, 1, 2 or 3;-   b is 0, 1 or 2; and-   B) an antidote-active amount of one or more compounds from groups a)    to e):-   a) compounds of the formulae (II) to (IV),-    in which the symbols and indices have the following definitions:    -   n′ is a natural number from 0 to 5, preferably from 0 to 3;    -   T is a (C₁- or C₂-)-alkanediyl chain which is unsubstituted or        substituted by one or two (C₁-C₄)-alkyl radicals or by        [(C₁-C₃)-alkoxy]carbonyl;    -   W is a radical from the group (W1) to (W4),    -   m′ is 0 or 1;    -   R¹⁷ and R¹⁹ are identical or different and are halogen,        (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy, nitro or (C₁-C₄)-haloalkyl;    -   R¹⁸ and R²⁰ are identical or different and are OR²⁴, SR²⁴ or        NR²⁴R²⁵ or a saturated or unsaturated 3- to 7-membered        heterocycle containing at least one nitrogen atom and up to 3        heteroatoms which is bonded by the nitrogen atom to the carbonyl        group in (II) or (III) and is unsubstituted or substituted by        radicals from the group consisting of (C₁-C₄)-alkyl,        (C₁-C₄)-alkoxy and unsubstituted or substituted phenyl,        preferably a radical of the formula OR²⁴, NHR²⁵ or N(CH₃)₂, in        particular of the formula OR²⁴;    -   R²⁴ is hydrogen or an unsubstituted or substituted aliphatic        hydrocarbon radical, preferably having a total of from 1 to 18        carbon atoms;    -   R²⁵ is hydrogen, (C₁-C₆)-alkyl, (C₁-C₆)-alkoxy or substituted or        unsubstituted phenyl;    -   R²⁶ is hydrogen, (C₁-C₈)-alkyl, (C₁-C₈)-haloalkyl,        (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl, (C₁-C₆)-hydroxyalkyl,        (C₃-C₁₂)-cycloalkyl or tri-(C₁-C₄)-alkylsilyl;    -   R²⁷, R²⁸ and R²⁹ are identical or different and are hydrogen,        (C₁-C₈)-alkyl, (C₁-C₆)-haloalkyl, (C₃-C₁₂)-cycloalkyl or        substituted or unsubstituted phenyl;    -   R²¹ is (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl, (C₂-C₄)-alkenyl,        (C₂-C₄)-haloalkenyl, (C₃-C₇)-cycloalkyl, preferably        dichloromethyl;    -   R²², R²³ are identical or different and are hydrogen,        (C₁-C₄)-alkyl, (C₂-C₄)-alkenyl, (C₂-C₄)-alkynyl,        (C₁-C₄)-haloalkyl, (C₂-C₄)-haloalkenyl,        (C₁-C₄)-alkylcarbamoyl-(C₁-C₄)-alkyl,        (C₂-C₄)-alkenylcarbamoyl-(C₁-C₄)-alkyl,        (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl, dioxolanyl-(C₁-C₄)-alkyl,        thiazolyl, furyl, furylalkyl, thienyl, piperidyl, substituted or        unsubstituted phenyl, or R²² and R²³ together form a substituted        or unsubstituted heterocyclic ring, preferably an oxazolidine,        thiazolidine, piperidine, morpholine, hexahydropyrimidine or        benzoxazine ring;-   b) one or more compounds from the following group:    -   1,8-naphthalic anhydride,    -   methyl diphenylmethoxyacetate,    -   cyanomethoxyimino(phenyl)acetonitrile (cyometrinile),    -   1,3-dioxolan-2-ylmethoxyimino(phenyl)acetonitrile (oxabetrinil),    -   4′-chloro-2,2,2-trifluoroacetophenone O-1,3-dioxolan-2-ylmethyl        oxime (fluxofenim),    -   4,6-dichloro-2-phenylpyrimidine (fenclorim),    -   benzyl 2-chloro-4-trifluoromethyl-1,3-thiazole-5-carboxylate        (flurazole),    -   2-dichloromethyl-2-methyl-1,3-dioxolane (MG-191),    -   N-(4-methylphenyl)-N′-(1-methyl-1-phenylethyl)urea (dymron),    -   1-[4-(N-2-methoxybenzoylsulfamoyl)phenyl]-3-methylurea,    -   1-[4-(N-2-methoxybenzoylsulfamoyl)phenyl]-3,3-dimethylurea,    -   1-[4-(N-4,5-dimethylbenzoylsulfamoyl)phenyl]-3-methylurea,    -   1-[4-(N-naphthoylsulfamoyl)phenyl]-3,3-dimethylurea,    -   (2,4-dichlorophenoxy)acetic acid (2,4-D),    -   (4-chlorophenoxy)acetic acid,    -   (R,S)-2-(4-chloro-o-tolyloxy)propionic acid (mecoprop),    -   4-(2,4-dichlorophenoxy)butyric acid (2,4-DB),    -   (4-chloro-o-tolyloxy)acetic acid (MCPA),    -   4-(4-chloro-o-tolyloxy)butyric acid,    -   4-(4-chlorophenoxy)butyric acid,    -   3,6-dichloro-2-methoxybenzoic acid (dicamba),    -   1-(ethoxycarbonyl)ethyl 3,6-dichloro-2-methoxybenzoate        (lactidichlor)    -   and their salts and esters, preferably (C₁-C₈);-   c) N-acylsulfonamides of the formula (V) and their salts,    in which-   R³⁰ is hydrogen, a carbon-containing radical such as a hydrocarbon    radical, a hydrocarbon-oxy radical, a hydrocarbon-amino radical, a    hydrocarbon-thio radical or a heterocyclyl radical, each of the 4    last-mentioned radicals being unsubstituted or being substituted by    one or more identical or different radicals selected from the group    consisting of halogen, cyano, nitro, amino, hydroxyl, carboxyl,    formyl, carboxamide, sulfonamide and radicals of the formula    -Z^(a)-R^(a), each hydrocarbon moiety preferably having 1 to 20    carbon atoms and a carbon-containing radical R³⁰ inclusive of    substituents preferably having 1 to 30 carbon atoms;-   R³¹ is hydrogen or (C₁-C₄)-alkyl, preferably hydrogen, or-   R³⁰ and R³¹ together with the group of the formula —CO—N— are the    residue of a 3- to 8-membered saturated or unsaturated ring;-   R³² is identical or different and is halogen, cyano, nitro, amino,    hydroxyl, carboxyl, formyl, CONH₂, SO₂NH₂ or a radical of the    formula -Z^(b)-R^(b);-   R³³ s hydrogen or (C₁-C₄)-alkyl, preferably hydrogen;-   R³⁴ is identical or different and is halogen, cyano, nitro, amino,    hydroxyl, carboxyl, CHO, CONH₂, SO₂NH₂ or a radical of the formula    -Z^(c)-R^(c);-   R^(a) is a hydrocarbon radical or a heterocyclyl radical, each of    the two last-mentioned radicals being unsubstituted or substituted    by one or more identical or different radicals selected from the    group consisting of halogen, cyano, nitro, amino, hydroxyl, mono-    and di-[(C₁-C₄)-alkyl]amino, or an alkyl radical in which a    plurality, preferably 2 or 3, non-adjacent CH₂ groups are in each    case replaced by one oxygen atom;-   R^(b),R^(c) are identical or different and are a hydrocarbon radical    or a heterocyclyl radical, each of the two last-mentioned radicals    being unsubstituted or substituted by one or more identical or    different radicals selected from the group consisting of halogen,    cyano, nitro, amino, hydroxyl, phosphoryl, halo-(C₁-C₄)-alkoxy,    mono- and di-[(C₁-C₄)-alkyl]amino, or an alkyl radical in which a    plurality, preferably 2 or 3, non-adjacent CH₂ groups are replaced    in each case by one oxygen atom;-   Z^(a) is a divalent group of the formula —O—, —S—, —CO—, —CS—,    —CO—O—, —CO—S—, —O—CO—, —S—CO—, —SO—, —SO₂—, —NR*—, —CO—NR*—,    —NR*—CO—, —SO₂—NR*— or —NR*—SO₂—, the bond given on the right-hand    side of each of the divalent groups being the bond to the radical    R^(a), and the radicals R* in the 5 last-mentioned radicals    independently of each other being in each case H, (C₁-C₄)-alkyl or    halo-(C₁-C₄)-alkyl;-   Z^(b), Z^(c) independently of one another are a direct bond or a    divalent group of the formula —O—, —S—, —CO—, —CS—, —CO—O—, —CO—S—,    —O—CO—, —S—CO—, —SO, SO₂—, —NR*—, —SO₂—NR*—, —NR*—SO₂—, —CO—NR*— or    —NR*—CO—, the bond given on the right-hand side of each of the    divalent groups being the bond is linked to the radical R^(b) or    R^(c) and the radicals R* in the 5 last-mentioned radicals    independently of one another are in each case H, (C₁-C₄)-alkyl or    halo-(C₁-C₄)-alkyl;-   n is an integer from 0 to 4, preferably 0, 1 or 2, in particular 0    or 1, and-   m is an integer from 0 to 5, preferably 0, 1, 2 or 3, in particular    0, 1 or 2;-   d) acylsulfamoylbenzamides of the formula (VI), optionally also in    salt form,    in which-   X³ is CH or N;-   R³⁵ is hydrogen, heterocyclyl or a hydrocarbon radical, the two    last-mentioned radicals optionally being substituted by one or more    identical or different radicals selected from the group consisting    of halogen, cyano, nitro, amino, hydroxyl, carboxyl, CHO, CONH₂,    SO₂NH₂ and Z^(a)-R^(a);-   R³⁶ is hydrogen, hydroxyl, (C₁-C₆)-alkyl, (C₂-C₆)-alkenyl,    (C₂-C₆)-alkynyl, (C₁-C₆)-alkoxy, (C₂-C₆)-alkenyloxy, the five    last-mentioned radicals optionally being substituted by one or more    identical or different radicals selected from the group consisting    of halogen, hydroxyl, (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy and    (C₁-C₄)-alkylthio, or-   R³⁵ and R³⁶ together with the nitrogen atom to which they are    attached are a 3- to 8-membered saturated or unsaturated ring;-   R³⁷ is halogen, cyano, nitro, amino, hydroxyl, carboxyl, CHO, CONH₂,    SO₂NH₂ or Z^(b)-R^(b);-   R³⁸ is hydrogen, (C₁-C₄)-alkyl, (C₂-C₄)-alkenyl or (C₂-C₄)-alkynyl;-   R³⁹ is halogen, cyano, nitro, amino, hydroxyl, carboxyl, phosphoryl,    CHO, CONH₂, SO₂NH₂ or Z^(c)-R^(c);-   R^(a) is a (C₂-C₂₀)-alkyl radical whose carbon chain is interrupted    once or more than once by oxygen atoms, or is heterocyclyl or a    hydrocarbon radical, the two last-mentioned radicals optionally    being substituted by one or more identical or different radicals    selected from the group consisting of halogen, cyano, nitro, amino,    hydroxyl, mono- and di-[(C₁-C₄)-alkyl]amino;-   R^(b), R^(c) are identical or different and are a (C₂-C₂₀)-alkyl    radical whose carbon chain is interrupted once or more than once by    oxygen atoms, or a heterocyclyl or a hydrocarbon radical, the two    last-mentioned radicals optionally being substituted by one or more    identical or different radicals selected from the group consisting    of halogen, cyano, nitro, amino, hydroxyl, phosphoryl,    (C₁-C₄)-haloalkoxy, mono- and di-[(C₁-C₄)-alkyl]amino;-   Z^(a) is a divalent unit selected from the group consisting of O, S,    CO, CS, C(O)O, C(O)S, SO, SO₂, NR^(d), C(O)NR^(d) or SO₂NR^(d);-   Z^(b), Z^(c) are identical or different and are a direct bond or a    divalent unit selected from the group consisting of O, S, CO, CS,    C(O)O, C(O)S, SO, SO₂, NR^(d), SO₂NR^(d) or C(O)NR^(d);-   R^(d) is hydrogen, (C₁-C₄)-alkyl or (C₁-C₄)-haloalkyl;-   r is an integer from 0 to 4, and-   q in the event that X³ is CH, is an integer from 0 to 5 and, in the    event that X is N, is an integer from 0 to 4;-   e) compounds of the formula (VII),    in which the symbols and indices have the following definitions:-   X is CH or N,-   p in the event that X=N, is an integer from 0 to 2 and, in the event    that X=CH, is an integer from 0 to 3;-   R⁴⁰ is halogen, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl, (C₁-C₄)-alkoxy,    (C₁-C₄)-haloalkoxy, nitro, (C₁-C₄)-alkylthio, (C₁-C₄)-alkylsulfonyl,    (C₁-C₄)-alkoxycarbonyl, phenyl or phenoxy, the two last-mentioned    radicals being unsubstituted or substituted by one or more,    preferably up to three, identical or different radicals from the    group consisting of halogen, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl,    (C₁-C₄)-alkoxy, halo-(C₁-C₄)-alkoxy, nitro and cyano;-   R⁴¹ is hydrogen or (C₁-C₄)-alkyl, and-   R⁴² is hydrogen, (C₁-C₈)-alkyl, (C₃-C₆)-cycloalkyl, (C₂-C₆)-alkenyl,    (C₂-C₆)-alkynyl or aryl, each of the aforementioned    carbon-containing radicals being unsubstituted or substituted by one    or more, preferably up to three, identical or different radicals    from the group consisting of halogen, nitro, cyano, hydroxyl,    (C₁-C₈)-alkoxy, in which one or more, preferably up to three, CH₂    groups may be replaced by oxygen, (C₁-C₄)-alkylthio,    (C₁-C₄)-alkylsulfonyl, (C₃-C₆)-cycloalkyl, (C₂-C₄)-alkenyloxy and    (C₂-C₄)-alkynyloxy,    inclusive of the stereoisomers and the agriculturally customary    salts.

A herbicidally effective amount is, for the purposes of the invention,an amount of one or more herbicides which is capable of adverselyaffecting plant growth.

An antidote-active amount is, for the purposes of the invention, anamount of one or more safeners which is capable of at least partiallycountering the phytotoxic effect of a herbicide or herbicide mixture ona crop plant.

Unless otherwise defined individually, the following definitionsgenerally apply to the radicals in the formulae (I) to (VIII) andsubsequent formulae.

The radicals alkyl, alkoxy, haloalkyl, haloalkoxy, alkylamino andalkylthio and the corresponding unsaturated and/or substituted radicalscan be in each case straight-chain or branched in the carbon skeleton.Alkyl radicals, also the composite meanings such as alkoxy, haloalkyland the like, preferably have 1 to 4 carbon atoms and are, for example,methyl, ethyl, n- or i-propyl or n-, i-, t- or 2-butyl. Alkenyl andalkynyl radicals have the meanings of the unsaturated radicals which arepossible and which correspond to the alkyl radicals; alkenyl is, forexample, allyl, 1-methylprop-2-en-1-yl, 2-methylprop-2-en-1-yl,but-2-en-1-yl, but-3-en-1-yl, 1-methylbut-3-en-1-yl and1-methylbut-2-en-1-yl. Alkynyl is, for example, propargyl,but-2-yn-1-yl, but-3-yn-1-yl, 1-methylbut-3-yn-1-yl. “(C₁-C₄)-Alkyl” isthe abbreviation for alkyl having 1 to 4 carbon atoms; the same appliesanalogously to other general definitions of radicals, where the rangesof the possible number of carbon atoms are indicated in brackets.

Cycloalkyl is, preferably, a cyclic alkyl radical having 3 to 8,preferably 3 to 7, especially preferably 3 to 6, carbon atoms, forexample cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.Cycloalkenyl and cycloalkynyl denote corresponding unsaturatedcompounds.

Halogen is fluorine, chlorine, bromine or iodine. Haloalkyl, haloalkenyland haloalkynyl are alkyl, alkenyl or alkynyl which are partially orfully substituted by halogen, preferably by fluorine, chlorine and/orbromine, in particular by fluorine or chlorine, for example CF₃, CHF₂,CH₂F, CF₂CF₃, CH₂FCClFM, CCl₃, CHCl₂, CH₂CH₂Cl. Haloalkoxy is, forexample, OCF₃, OCHF₂, OCH₂F, OCF₂CF₃, OCH₂CF₃ and OCH₂CH₂Cl. This alsoapplies analogously to other halogen-substituted radicals.

An aliphatic hydrocarbon radical is generally a straight-chain orbranched saturated or unsaturated hydrocarbon radical, preferably having1 to 18, especially preferably 1 to 12, carbon atoms, for example alkyl,alkenyl or alkynyl. Aryl is generally a mono-, bi- or polycyclicaromatic system having preferably 6 to 14 carbon atoms, for examplephenyl, naphthyl, pentalenyltetrahydronaphthyl, indenyl, indanyl andfluorenyl, especially preferably phenyl. Aliphatic hydrocarbon radicalpreferably means alkyl, alkenyl or alkynyl having up to 12 carbon atoms;the same applies analogously to an aliphatic hydrocarbon radical in ahydrocarbon-oxy radical.

Heterocyclic ring, heterocyclic radical or heterocyclyl is a mono-, bi-or polycyclic ring system which is saturated, unsaturated and/oraromatic and contains one or more, preferably 1 to 4, heteroatoms,preferably selected from the group consisting of N, S and O. Preferredare saturated heterocycles having 3 to 7 ring atoms and one or twoheteroatoms selected from the group consisting of N, O and S, chalcogensnot being adjacent. Especially preferred are monocyclic rings having 3to 7 ring atoms and a heteroatom selected from the group consisting ofN, O and S, and also morpholine, dioxolane, piperazine, imidazoline andoxazolidine. Very especially preferred saturated heterocycles areoxirane, pyrrolidone, morpholine and tetrahydrofuran. Also preferred arepartially unsaturated heterocycles having 5 to 7 ring atoms and one ortwo heteroatoms selected from the group consisting of N, O and S.Especially preferred are partially unsaturated heterocycles having 5 to6 ring atoms and one heteroatom selected from the group consisting of N,O and S. Very especially preferred partially unsaturated heterocyclesare pyrazoline, imidazoline and isoxazoline. Equally preferred are mono-or bicyclic aromatic heterocycles having 5 to 6 ring atoms which containone to four heteroatoms selected from the group consisting of N, O, S,chalcogens not being adjacent. Especially preferred are monocyclicaromatic heterocycles having 5 to 6 ring atoms which contain aheteroatom selected from the group consisting of N, O and S, and alsopyrimidine, pyrazine, pyridazine, oxazole, thiazole, thiadiazole,oxadiazole, pyrazole, triazole and isoxazole. Very especially preferredare pyrazole, thiazole, triazole and furan.

Substituted radicals, such as substituted hydrocarbon radicals, forexample substituted alkyl, alkenyl, alkynyl, aryl, phenyl and arylalkylsuch as benzyl, or substituted heterocyclyl or heteroaryl, are asubstituted radical which is derived from the unsubstituted parentstructure, the substituents being, by preference, one or more,preferably 1, 2 or 3, in the case of Cl and F also up to the maximumpossible number of, radicals selected from the group consisting ofhalogen, alkoxy, haloalkoxy, alkylthio, hydroxyl, amino, nitro,carboxyl, cyano, azido, alkoxycarbonyl, alkylcarbonyl, formyl,carbamoyl, mono- and dialkylaminocarbonyl, substituted amino such asacylamino, mono- and dialkylamino and alkylsulfinyl, haloalkylsulfinyl,alkylsulfonyl, haloalkylsulfonyl and, in the case of cyclic radicals,also alkyl and haloalkyl and the unsaturated aliphatic radicals whichcorrespond to the abovementioned saturated hydrocarbon-containingsubstituents, preferably alkenyl, alkynyl, alkenyloxy and alkynyloxy. Inthe case of radicals having carbon atoms, those having 1 to 4 carbonatoms, in particular 1 or 2 carbon atoms, are preferred. As a rule,preferred radicals are those selected from the group consisting ofhalogen, for example fluorine or chlorine, (C₁-C₄)-alkyl, preferablymethyl or ethyl, (C₁-C₄)-haloalkyl, preferably trifluoromethyl,(C₁-C₄)-alkoxy, preferably methoxy or ethoxy, (C₁-C₄)-haloalkoxy, nitroand cyano. Especially preferred in this context are the substituentsmethyl, methoxy and chlorine.

Mono- or disubstituted amino is a chemically stable radical selectedfrom the group of the substituted amino radicals which are N-substitutedby, for example, one or two identical or different radicals selectedfrom the group consisting of alkyl, alkoxy, acyl and aryl; preferablymonoalkylamino, dialkylamino, acylamino, arylamino, N-alkyl-N-arylaminoand N-heterocycles. Preferred in this context are alkyl radicals having1 to 4 carbon atoms. By preference, aryl is phenyl or substitutedphenyl. By preference, substituted aryl is substituted phenyl. Thedefinition given further below applies to acyl, preferably(C₁-C₄)-alkanoyl. This also applies analogously to substitutedhydroxylamino or hydrazino.

By preference, optionally substituted phenyl is phenyl which isunsubstituted or mono- or polysubstituted, preferably up totrisubstituted, in the case of halogen such as Cl and F also up topentasubstituted, by identical or different radicals selected from thegroup consisting of halogen, (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy,(C₁-C₄)-haloalkyl, (C₁-C₄)-haloalkoxy and nitro, for example o-, m- andp-tolyl, dimethylphenyls, 2-, 3- and 4-chlorophenyl, 2-, 3- and4-trifluoro- and -trichlorophenyl, 2,4-, 3,5-, 2,5- and2,3-dichlorophenyl, o-, m- and p-methoxyphenyl.

An acyl radical is the radical of an organic acid having by preferenceup to 6 carbon atoms, for example the radical of a carboxylic acid andradicals of acids derived therefrom, such as thiocarboxylic acid,optionally N-substituted iminocarboxylic acids, or the radical ofcarbonic monoesters, optionally N-substituted carbamic acids, sulfonicacids, sulfinic acids, phosphonic acids, phosphinic acids. Acyl is, forexample, formyl, alkylcarbonyl such as (C₁-C₄-alkyl)carbonyl,phenylcarbonyl, it being possible for the phenyl ring to be substituted,for example as indicated above for phenyl, or alkyloxycarbonyl,phenyloxycarbonyl, benzyloxycarbonyl, alkylsulfonyl, alkylsulfinyl orN-alkyl-1-iminoalkyl.

All stereoisomers which show the same topological linkage of the atoms,and their mixtures, also fall under the formulae (I) to (VIII). Suchcompounds contain one or more asymmetric carbon atoms or else doublebonds which are not indicated specifically in the general formulae. Thestereoisomers which are possible which are defined by their specificspatial form, such as enantiomers, diastereomers, Z- and E-isomers, canbe obtained from mixtures of the stereoisomers by customary methods orelse be prepared by stereoselective reactions in combination with theuse of stereochemically pure starting materials.

Herbicidally active substances which are suitable in accordance with theinvention are those compounds of the formula (I) which, on their own,cannot be used, or not optimally used, in crops of useful plants such ascereal crops, rice or corn because they are too harmful to the cropplants.

Herbicides of the formula (I) are known, for example, from WO-A 00/21924and WO-A 01/7422.

The cited publications contain extensive data on preparation processesand starting materials. These publications are referred to exclusivelyand are considered by such reference to be part of this description.

The compounds of the formula (II) are known, for example, from EP-A-0333 131 (ZA-89/1960), EP-A-0 269 806 (U.S. Pat. No. 4,891,057), EP-A-0346 620 (AU-A-89/34951), EP-A-0 174 562, EP-A-0 346 620 (WO-A-91/08202), WO-A-91/07 874 or WO-A 95/07 897 (ZA 94/7120) and the literaturecited therein or can be prepared by or analogously to the processesdescribed therein. The compounds of the formula (III) are known fromEP-A-0 086 750, EP-A-0 94349 (U.S. Pat. No. 4,902,340), EP-A-0 191736(U.S. Pat. No. 4,881,966) and EP-A-0 492 366 and the literature citedtherein or can be prepared by or analogously to the processes describedtherein. Furthermore, some compounds are described in EP-A-0 582 198.The compounds of the formula (II) are known from a large number ofpatent applications, for example U.S. Pat. No. 4,021,224 and U.S. Pat.No. 4,021,229. Moreover, compounds of group (b) are known fromCN-A-87/102 789, EP-A-0 365 484 and from “The Pesticide Manual”, TheBritish Crop Protection Council and the Royal Society of Chemistry, 11thedition, Famham 1997. The compounds of group (c) are described inWO-A-97/45016, those of group (d) in German Patent Application 197 42951.3 and those of group (e) in WO-A 98/13 361.

The publications cited contain detailed information on preparationprocesses and starting materials. These publications are referred toexplicitly and are considered by such reference to be part of thisdescription.

For the purpose of the present specification, the terms “herbicidalcompositions” and “herbicide/safener combinations” are to be understoodas being synonymous.

Preference is given to herbicidal compositions comprising compounds ofthe formula (I) wherein the symbols and indices have the followingdefinitions:

-   R¹ is nitro, cyano, chlorine, fluorine, methyl, trifluoromethyl,    methylsulfonyl or ethylsulfonyl;-   R² is pentafluoroethoxymethyl, 2,2-difluoroethoxymethyl,    2,2,2-trifluoroethoxymethyl, 2,2,3,3-tetrafluoropropoxymethyl,    cyclopentyloxymethyl, cyclohexyloxymethyl, cyclopropyloxy,    tetrahydrofuran-2-ylmethoxymethyl, methoxyethoxyethoxymethyl, or    4,5-dihydroisoxazol-3-yl substituted by a radical from the group    consisting of cyanomethyl, ethoxymethyl and methoxymethyl;-   R³ is OR⁵;-   R⁵ is hydrogen;-   a is 2;-   b is 0, and in which the two radicals R¹ are in positions 2 and 4 of    the phenyl ring.

Preferred herbicidal compositions are those which comprise safeners ofthe formula (II) and/or (III) wherein the symbols and indices have thefollowing definitions:

-   R²⁴ is hydrogen, (C₁-C₁₈)-alkyl, (C₃-C₁₂)-cycloalkyl,    (C₂-C₈)-alkenyl and (C₂-C₁₈)-alkynyl, where the carbon-containing    groups can be substituted by one or more, preferably up to three,    radicals R⁵⁰;-   R⁵⁰ is identical or different and is halogen, hydroxyl,    (C₁-C₈)-alkoxy, (C₁-C₈)-alkylthio, (C₂-C₈)-alkenylthio,    (C₂-C₈)-alkynylthio, (C₂-C₈)-alkenyloxy, (C₂-C₈)-alkynyloxy,    (C₃-C₇)-cycloalkyl, (C₃-C₇)-cycloalkoxy, cyano, mono- and    di-(C₁-C₄)-alkylamino, carboxyl, (C₁-C₈)-alkoxycarbonyl,    (C₂-C₈)-alkenyloxycarbonyl, (C₁-C₈)-alkylthiocarbonyl,    (C₂-C₈)-alkynyloxycarbonyl, (C₁-C₈)-alkylcarbonyl,    (C₂-C₈)-alkenylcarbonyl, (C₂-C₈)-alkynylcarbonyl,    1-(hydroxyimino)-(C₁-C₆)-alkyl,    1-[(C₁-C₄)-alkylimino]-(C₁-C₄)-alkyl,    1-[(C₁-C₄)-alkoxyimino]-(C₁-C₆)-alkyl, (C₁-C₈)-alkylcarbonylamino,    (C₂-C₈)-alkenylcarbonylamino, (C₂-C₈)-alkynylcarbonylamino,    aminocarbonyl, (C₁-C₈)-alkylaminocarbonyl,    di-(C₁-C₆)-alkylaminocarbonyl, (C₂-C₆)-alkenylaminocarbonyl,    (C₂-C₆)-alkynylaminocarbonyl, (C₁-C₈)-alkoxycarbonylamino,    (C₁-C₈)-alkylaminocarbonylamino, (C₁-C₆)-alkylcarbonyloxy which is    unsubstituted or substituted by R⁵¹, or is    (C₂-C₆)-alkenylcarbonyloxy, (C₂-C₆)-alkynylcarbonyloxy,    (C₁-C₈)-alkylsulfonyl, phenyl, phenyl-(C₁-C₆)-alkoxy,    phenyl-(C₁-C₆)-alkoxycarbonyl, phenoxy, phenoxy-(C₁-C₆)-alkoxy,    phenoxy-(C₁-C₆)-alkoxycarbonyl, phenylcarbonyloxy,    phenylcarbonylamino, phenyl-(C₁-C₆)-alkylcarbonylamino, the    last-mentioned 9 radicals on the phenyl ring being unsubstituted or    mono- or polysubstituted, preferably up to trisubstituted, by    radicals R⁵²; SiR′₃, —OSiR′₃, R′₃Si—(C₁-C₈)-alkoxy, —CO—O—NR′₂,    —O—N═CR′₂, —N═CR′₂, —O—N—R′₂, —NR′₂, CH(OR′)₂,    —O—(CH₂)_(m)—CH(OR′)₂, —CR′″(OR′)₂, —O—(CH₂)_(m)CR′″(OR″)₂ or by    R″O—CHR′″CHCOR″—(C₁-C₆)-alkoxy,-   R⁵¹ is identical or different and is halogen, nitro, (C₁-C₄)-alkoxy    and phenyl which is unsubstituted or substituted by one or more,    preferably up to three, radicals R⁵¹;-   R⁵² is identical or different and is halogen, (C₁-C₄)-alkyl,    (C₁-C₄)-alkoxy, (C₁-C₄)-haloalkyl, (C₁-C₄)-haloalkoxy or nitro;-   R′ is identical or different and is hydrogen, (C₁-C₄)-alkyl, phenyl    which is unsubstituted or substituted by one or more, preferably up    to three, radicals R⁵², or two radicals R′ together form a    (C₂-C₆)-alkanediyl chain;-   R″ is identical or different and is (C₁-C₄)-alkyl, or two radicals    R″ together form a (C₂-C₆)-alkanediyl chain;-   R′″ is hydrogen or (C₁-C₄)-alkyl;-   w is 0, 1, 2, 3, 4, 5 or 6.

Especially preferred are herbicidal compositions which comprise safenersof the formula (II) and/or (III) wherein the symbols and indices havethe following definitions:

-   R²⁴ is hydrogen, (C₁-C₈)-alkyl or (C₃-C₇)-cycloalkyl, the above    carbon-containing radicals being unsubstituted or mono- or    polysubstituted by halogen or mono- or disubstituted, by preference    monosubstituted, by radicals R⁵⁰,-   R⁵⁰ is identical or different and is hydroxyl, (C₁-C₄)-alkoxy,    carboxyl, (C₁-C₄)-alkoxycarbonyl, (C₂-C₆)-alkenyloxycarbonyl,    (C₂-C₆)-alkynyloxycarbonyl, 1-(hydroxyimino)-(C₁-C₄)-alkyl,    1-[(C₁-C₄)-alkylimino]-(C₁-C₄)-alkyl and    1-[(C₁-C₄)-alkoxyimino]-(C₁-C₄)-alkyl; —SiR′₃, —O—N═CR′₂, —N═CR′₂,    —NR′₂ and —ONR′₂ where R′ is identical or different and is hydrogen,    (C₁-C₄)-alkyl or, as a pair, a (C₄-C₅)-alkanediyl chain,-   R²⁷, R²⁸, R²⁹ are identical or different and are hydrogen,    (C₁-C₈)-alkyl, (C₁-C₆)-haloalkyl, (C₃-C₇)-cycloalkyl or phenyl which    is unsubstituted or substituted by one or more radicals selected    from the group consisting of halogen, cyano, nitro, amino, mono- and    di-[(C₁-C₄)-alkyl]amino, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl,    (C₁-C₄)-alkoxy, (C₁-C₄)-haloalkoxy, (C₁-C₄)-alkylthio and    (C₁-C₄)-alkylsulfonyl;-   R¹⁷, R¹⁹ are identical or different and are hydrogen, halogen,    methyl, ethyl, methoxy, ethoxy, (C₁ or C₂)-haloalkyl, by preference    hydrogen, halogen or (C₁ or C₂)-haloalkyl.

Especially preferred are herbicidal compositions comprising safeners ofthe formula (II) in which the symbols and indices have the followingdefinitions:

-   R¹⁷ is hydrogen, halogen, nitro or (C₁-C₄)-haloalkyl;-   n′ is 1, 2 or 3;-   R¹⁸ is a radical of the formula OR²⁴;-   R²⁴ is hydrogen, (C₁-C₈)-alkyl or (C₃-C₇)-cycloalkyl, where the    above carbon-containing radicals are unsubstituted or mono- or    polysubstituted, by preference up to trisubstituted, by identical or    different halogen radicals or up to disubstituted, by preference    monosubstituted, by identical or different radicals selected from    the group consisting of hydroxyl, (C₁-C₄)-alkoxy,    (C₁-C₄)-alkoxycarbonyl, (C₂-C₆)-alkenyloxycarbonyl,    (C₂-C₆)-alkynyloxycarbonyl, 1-(hydroxyimino)-(C₁-C₄)-alkyl,    1-[(C₁-C₄)-alkylimino]-(C₁-C₄)-alkyl,    1-[(C₁-C₄)-alkoxyimino]-(C₁-C₄)-alkyl and radicals of the formulae    —SiR′₃, —O—N═R′₂, —N═CR′₂, —NR′₂ and —O—NR′₂, where the radicals R′    in the above-mentioned formulae are identical or different and are    hydrogen, (C₁-C₄)-alkyl or, as a pair, are (C₄ or C₅)-alkanediyl;-   R²⁷, R²⁸, R²⁹ are identical or different and are hydrogen,    (C₁-C₈)-alkyl, (C₁-C₆)-haloalkyl, (C₃-C₇)-cycloalkyl or phenyl which    is unsubstituted or substituted by one or more of the radicals    selected from the group consisting of halogen, (C₁-C₄)-alkyl,    (C₁-C₄)-alkoxy, nitro, (C₁-C₄)-haloalkyl and (C₁-C₄)-haloalkoxy.

Also especially preferred are herbicidal compositions comprisingsafeners of the formula (III) wherein the symbols and indices have thefollowing definitions:

-   R¹⁹ is hydrogen, halogen or (C₁-C₄)-haloalkyl;-   n′ is 1, 2 or 3, where (R¹⁹)_(n′) is by preference 5-Cl;-   R²⁰ is a radical of the formula OR²⁴;-   T is CH₂and-   R²⁴ is hydrogen, (C₁-C₈)-alkyl, (C₁-C₈)-haloalkyl or    (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl, by preference (C₁-C₈)-alkyl.

Especially preferred are herbicidal compositions comprising safeners ofthe formula (II) wherein the symbols and indices have the followingdefinitions:

-   W is (W1);-   R¹⁷ is hydrogen, halogen or (C₁-C₂)-haloalkyl;-   n′ is 1, 2 or 3, where (R¹⁷)_(n′) is by preference 2,4-Cl₂;-   R¹⁸ is a radical of the formula OR²⁴;-   R²⁴ is hydrogen, (C₁-C₈)-alkyl, (C₁-C₄)-haloalkyl,    (C₁-C₄)-hydroxyalkyl, (C₃-C₇)-cycloalkyl,    (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl or tri-(C₁-C₂)-alkylsilyl, by    preference (C₁-C₄)-alkyl;-   R²⁷ is hydrogen, (C₁-C₈)-alkyl, (C₁-C₄)-haloalkyl or    (C₃-C₇)-cycloalkyl, by preference hydrogen or (C₁-C₄)-alkyl, and-   R²⁶ is hydrogen or (C₁-C₄)-alkyl.

Also especially preferred are herbicidal compositions comprisingsafeners of the formula (II) wherein the symbols and indices have thefollowing definitions:

-   W is (W2);-   R¹⁷ is hydrogen, halogen or (C₁-C₂)-haloalkyl;-   n′ is 1, 2 or 3, where (R¹⁷)_(n′) is by preference 2,4-Cl₂;-   R¹⁸ is a radical of the formula OR²⁴;-   R²⁴ is hydrogen, (C₁-C₈)-alkyl, (C₁-C₄)-haloalkyl,    (C₁-C₄)-hydroxyalkyl, (C₃-C₇)-cycloalkyl, (C₁-C₄-alkoxy)-C₁-C₄-alkyl    or tri-(C₁-C₂)-alkyl-silyl, by preference (C₁-C₄)-alkyl, and-   R²⁷ is hydrogen, (C₁-C₈)-alkyl, (C₁-C₄)-haloalkyl,    (C₃-C₇)-cycloalkyl or phenyl, by preference hydrogen or    (C₁-C₄)-alkyl.

Also especially preferred are herbicidal compositions comprisingsafeners of the formula (II) wherein the symbols and indices have thefollowing definitions:

-   W is (W3);-   R¹⁷ is hydrogen, halogen or (C₁-C₂)-haloalkyl;-   n′ is 1, 2 or 3, where (R¹⁷)_(n′) is by preference 2,4-Cl₂;-   R¹⁸ is a radical of the formula OR²⁴;-   R²⁴ is hydrogen, (C₁-C₈)-alkyl, (C₃-C₇)-cycloalkyl, by preference    (C₁-C₄)-alkyl, and-   R²⁸ is (C₁-C₈)-alkyl or (C₁-C₄)-haloalkyl, by preference    C₁-haloalkyl.

Also especially preferred are herbicidal compositions comprisingsafeners of the formula (II) wherein the symbols and indices have thefollowing definitions:

-   W is (W4);-   R¹⁷ is hydrogen, halogen, nitro, (C₁-C₄)-alkyl, (C₁-C₂)-haloalkyl,    by preference CF₃;-   n′ is 1, 2 or 3;-   m′ is 0 or 1;-   R¹⁸ is a radical of the formula OR²⁴;-   R²⁴ is hydrogen, (C₁-C₄)-alkyl, carboxy-(C₁-C₄)-alkyl,    (C₁-C₄)-alkoxycarbonyl-(C₁-C₄)-alkyl, by preference    (C₁-C₄)-alkoxy-CO—CH₂—, (C₁-C₄)-alkoxy-CO—C(CH₃)(H)—, HO—CO—CH₂— or    HO—CO—C(CH₃)(H)—, and-   R²⁹ is hydrogen, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl,    (C₃-C₇)-cycloalkyl or phenyl which is unsubstituted or substituted    by one or more of the radicals selected from the group consisting of    halogen, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl, nitro, cyano and    (C₁-C₄)-alkoxy.

The following groups of compounds are especially suitable for use assafeners for the herbicidally active substances of the formula (I):

-   a) Compounds of the dichlorophenylpyrazoline-3-carboxylic acid type    (i.e. of the formula (II) where W=W1 and (R¹⁷)_(n′)=2,4-Cl₂), by    preference compounds such as ethyl    1-(2,4-dichlorophenyl)-5-(ethoxycarbonyl)-5-methyl-2-pyrazoline-3-carboxylate    (II-1), and related compounds as they are described in WO-A    91/07874;-   b) dichlorophenylpyrazolecarboxylic acid derivatives (i.e. of the    formula (II) where W=(W2) and (R¹⁷)_(n′)=2,4-Cl₂), by preference    compounds such as ethyl    1-(2,4-dichlorophenyl)-5-methylpyrazole-3-carboxylate (II-2), ethyl    1-(2,4-dichlorophenyl)-5-isopropylpyrazole-3-carboxylate (II-3),    ethyl    1-(2,4-dichlorophenyl)-5-(1,1-dimethylethyl)pyrazole-3-carboxylate    (II-4), ethyl 1-(2,4-dichlorophenyl)-5-phenylpyrazole-3-carboxylate    (II-5) and related compounds as they are described in EP-A-0 333 131    and EP-A-0 269 806.-   c) Compounds of the triazolecarboxylic acid type (i.e. of the    formula (II) where W=(W3) and (R¹⁷)_(n′)=2,4-Cl₂), by preference    compounds such as fenchlorazol, i.e. ethyl    1-(2,4-dichlorophenyl)-5-trichloromethyl-(1H)-1,2,4-triazole-3-carboxylate    (II-6), and related compounds (see EP-A-0 174 562 and EP-A-0 346    620);-   d) compounds of the 5-benzyl- or 5-phenyl-2-isoxazoline-3-carboxylic    acid type or the 5,5-diphenyl-2-isoxazoline-3-carboxylic acid type    (where W=(W4)), by preference compounds such as ethyl    5-(2,4-dichlorobenzyl)-2-isoxazoline-3-carboxylate (II-7) or ethyl    5-phenyl-2-isoxazoline-3-carboxylate (II-8) and related compounds as    they are described in WO-A-91/08202, or ethyl    5,5-diphenyl-2-isoxazoline-3-carboxylate (II-9) or n-propyl    5,5-diphenyl-2-isoxazoline-3-carboxylate (II-10) or ethyl    5-(4-fluorophenyl)-5-phenyl-2-isoxazoline-3-carboxylate (II-11), as    they are described in WO-A-95/07897.-   e) Compounds of the 8-quinolinoxyacetic acid type, for example those    of the formula (III) where (R¹⁹)_(n′)=5-Cl or hydrogen, R²⁰=OR²⁴ and    T=CH₂, by preference the compounds    -   1-methylhexyl (5-chloro-8-quinolinoxy)acetate (III-1,        cloquintocet-mexyl),    -   1,3-dimethylbut-1-yl (5-chloro-8-quinolinoxy)acetate (III-2),    -   4-allyloxybutyl (5-chloro-8-quinolinoxy)acetate (III-3),    -   1-allyloxyprop-2-yl (5-chloro-8-quinolinoxy)acetate (III-4),    -   ethyl (5-chloro-8-quinolinoxy)acetate (III-5),    -   methyl (5-chloro-8-quinolinoxy)acetate (III-6),    -   allyl (5-chloro-8-quinolinoxy)acetate (III-7),    -   2-(2-propylideniminoxy)-1-ethyl (5-chloro-8-quinolinoxy)acetate        (III-8),    -   2-oxoprop-1-yl (5-chloro-8-quinolinoxy)acetate (III-9)    -   and related compounds as they are described in EP-A-0 860 750,        EP-A-0 094 349 and EP-A-0 191 736 or EP-A-0 492 366.-   f) Compounds of the (5-chloro-8-quinolinoxy)malonic acid type, i.e.    of the formula (III) where (R¹⁷)_(n′)=5-Cl, R²⁰=OR²⁴,    T=—CH(COO-alkyl)-, by preference the compounds diethyl    (5-chloro-8-quinolinoxy)malonate, diallyl    (5-chloro-8-quinolinoxy)malonate, methyl ethyl    (5-chloro-8-quinolinoxy)malonate and related compounds as they are    described in EP-A-0 582 198.-   g) Compounds of the dichloroacetamide type, i.e. of the formula    (IV), by preference:    -   N,N-diallyl-2,2-dichloroacetamide (dichlormid, from U.S. Pat.        No. 4,137,070),    -   4-dichloroacetyl-3,4-dihydro-3-methyl-2H-1,4-benzoxazine        (benoxacor, from EP 0 149 974),    -   N1,N2-diallyl-N-2-dichloroacetylglycinamide (DKA-24, from HU        2143821),

4-dichloroacetyl-1-oxa-4-azaspiro[4,5]decane (AD-67),

-   -   2,2-dichloro-N-(1,3-dioxolan-2-ylmethyl)-N-(2-propenyl)acetamide        (PPG-1292),    -   3-dichloroacetyl-2,2,5-trimethyloxazolidine,    -   3-dichloroacetyl-2,2-dimethyl-5-phenyloxazolidine,    -   3-dichloroacetyl-2,2-dimethyl-5-(2-thienyl)oxazolidine,    -   3-dichloroacetyl-5-(2-furanyl)-2,2-dimethyloxazolidine        (furilazole, MON 13900),    -   1-dichloroacetylhexahydro-3,3,8a-trimethylpyrrolo[1,2-a]pyrimidin-6        (2H)-one (dicyclonon, BAS 145138),

-   h) compounds of group B(b), by preference    -   1,8-naphthalic anhydride,    -   methyl diphenylmethoxyacetate,    -   cyanomethoxyimino(phenyl)acetonitrile (cyometrinil),    -   1,3-dioxolan-2-ylmethoxyimino(phenyl)acetonitrile (oxabetrinil),    -   4′-chloro-2,2,2-trifluoroacetophenone O-1,3-dioxolan-2-ylmethyl        oxime (fluxofenim),    -   4,6-dichloro-2-phenylpyrimidine (fenclorim),    -   benzyl 2-chloro-4-trifluoromethyl-1,3-thiazole-5-carboxylate        (flurazole),    -   2-dichloromethyl-2-methyl-1,3-dioxolane (MG-191),    -   N-(4-methylphenyl)-N′-(1-methyl-1-phenylethyl)urea (dymron),    -   1-[4-(N-2-methoxybenzoylsulfamoyl)phenyl]-3-methylurea,    -   1-[4-(N-2-methoxybenzoylsulfamoyl)phenyl]-3,3-dimethylurea,    -   1-[4-(N-4,5-dimethylbenzoylsulfamoyl)phenyl]-3-methylurea,    -   1-[4-(N-naphthoylsulfamoyl)phenyl]-3,3-dimethylurea,    -   (2,4-dichlorophenoxy)acetic acid (2,4-D),    -   (4-chlorophenoxy)acetic acid,    -   (R,S)-2-(4-chloro-o-tolyloxy)propionic acid (mecoprop),    -   4-(2,4-dichlorophenoxy)butyric acid (2,4-DB),    -   (4-chloro-o-tolyloxy)acetic acid (MCPA),    -   4-(4-chloro-o-tolyloxy)butyric acid,    -   4-(4-chlorophenoxy)butyric acid,    -   3,6-dichloro-2-methoxybenzoic acid (dicamba),    -   1-(ethoxycarbonyl)ethyl 3,6-dichloro-2-methoxybenzoate        (lactidichlor),    -   and their salts and esters, by preference (C₁-C₈).

Further preferred safeners are compounds of the formula (V) or saltsthereof in which

-   R³⁰ is hydrogen, (C₁-C₆)-alkyl, (C₃-C₆)-cycloalkyl, where each of    the last-mentioned 2 radicals is unsubstituted or substituted by one    or more substituents selected from the group consisting of halogen,    (C₁-C₄)-alkoxy, halo-(C₁-C₆)-alkoxy and (C₁-C₄)-alkylthio and, in    the case of cyclic radicals, also (C₁-C₄)-alkyl and    (C₁-C₄)-haloalkyl,-   R³¹ is hydrogen;-   R³² is halogen, halo-(C₁-C₄)-alkyl, halo-(C₁-C₄)-alkoxy,    (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy, (C₁-C₄)-alkylsulfonyl,    (C₁-C₄)-alkoxycarbonyl or (C₁-C₄)-alkylcarbonyl, by preference    halogen, (C₁-C₄)-haloalkyl such as trifluoromethyl, (C₁-C₄)-alkoxy,    halo-(C₁-C₄)-alkoxy, (C₁-C₄)-alkoxycarbonyl or    (C₁-C₄)-alkylsulfonyl,-   R³³ is hydrogen;-   R³⁴ is halogen, (C₁-C₄)-alkyl, halo-(C₁-C₄)-alkyl,    halo-(C₁-C₄)-alkoxy, (C₃-C₆)-cycloalkyl, phenyl, (C₁-C₄)-alkoxy,    cyano, (C₁-C₄)-alkylthio, (C₁-C₄)-alkylsulfinyl,    (C₁-C₄)-alkylsulfonyl, (C₁-C₄)-alkoxycarbonyl or    (C₁-C₄)-alkylcarbonyl, by preference halogen, (C₁-C₄)-alkyl,    (C₁-C₄)-haloalkyl such as trifluoromethyl, halo-(C₁-C₄)-alkoxy,    (C₁-C₄)-alkoxy or (C₁-C₄)-alkylthio,-   n is 0, 1 or 2 and-   m is 1 or 2.

Also preferred are safeners of the formula (VI) in which

-   X³ is CH;-   R³⁵ is hydrogen, (C₁-C₆)-alkyl, (C₃-C₆)-cycloalkyl, (C₂-C₆)-alkenyl,    (C₅-C₆)-cycloalkenyl, phenyl or 3- to 6-membered heterocyclyl having    up to three heteroatoms selected from the group consisting of    nitrogen, oxygen and sulfur, the six last-mentioned radicals    optionally being substituted by one or more identical or different    substituents selected from the group consisting of halogen,    (C₁-C₆)-alkoxy, (C₁-C₆)-haloalkoxy, (C₁-C₂)-alkylsulfinyl,    (C₁-C₂)-alkylsulfonyl, (C₃-C₆)-cycloalkyl, (C₁-C₄)-alkoxycarbonyl,    (C₁-C₄)-alkylcarbonyl and phenyl and in the case of cyclic radicals,    also (C₁-C₄)-alkyl and (C₁-C₄)-haloalkyl;-   R³⁶ is hydrogen, (C₁-C₆)-alkyl, (C₂-C₆)-alkenyl, (C₂-C₆)-alkynyl,    the three last-mentioned radicals optionally being substituted by    one or more identical or different substituents selected from the    group consisting of halogen, hydroxyl, (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy    and (C₁-C₄)-alkylthio;-   R³⁷ is halogen, (C₁-C₄)-haloalkyl, (C₁-C₄)-haloalkoxy, nitro,    (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy, (C₁-C₄)-alkylsulfonyl,    (C₁-C₄)-alkoxycarbonyl or (C₁-C₄)-alkylcarbonyl;-   R³⁸ is hydrogen;-   R³⁹ is halogen, nitro, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl,    (C₁-C₄)-haloalkoxy, (C₃-C₆)-cycloalkyl, phenyl, (C₁-C₄)-alkoxy,    cyano, (C₁-C₄)-alkylthio, (C₁-C₄)-alkylsulfinyl,    (C₁-C₄)-alkylsulfonyl, (C₁-C₄)-alkoxycarbonyl or    (C₁-C₄)-alkylcarbonyl;-   r is 0, 1 or 2 and-   q is 1 or 2.

Further particularly preferred safeners are compounds of the formula(VII), in which

-   R⁴⁰ is trifluoromethyl,-   R⁴¹ is hydrogen, and-   R⁴² is hydrogen, methyl or ethyl.

The compounds cited here as safeners (antidotes) reduce or preventphytotoxic effects which may occur when using the herbicidally activesubstances of the formula (I) in crops of useful plants withoutsubstantially affecting the activity of these herbicidally activesubstances against weed plants. This allows the field of application ofconventional crop protection products to be widened quite considerablyand to be extended to, for example, crops such as wheat, barley, corn,and sugar cane in which use of the herbicides was hitherto impossible,or of only limited possibility, that is to say at low rates and with arestricted spectrum.

The herbicidally active substances and the abovementioned safeners canbe applied together (as a readymix or by the tank mix method) or insuccession in any desired sequence. The weight ratio of safener toherbicidally active substance may vary within wide limits and ispreferably within the range from 1:100 to 100:1, in particular from 1:10to 10:1. The optimum amounts of herbicidally active substance andsafener in each case depend on the type of the herbicidally activesubstance used or on the safener used and on the species of the plantstand to be treated and can be determined in each individual case bysimple, routine preliminary experiments.

Main fields of application for the combinations according to theinvention are, in particular, corn, sugar cane and cereal crops forexample wheat, rye, barley, oats, rice, sorghum, but also cotton andsoybeans, preferably sugar cane, cereals, rice and corn.

Depending on their properties, the safeners employed in accordance withthe invention can be used for pretreating the seeds of a crop plant(seed dressing), or be incorporated into the seed furrows prior tosowing or applied together with the herbicide before or after plantemergence. The preemergence treatment includes both the treatment of thearea under cultivation prior to sowing and the treatment of the areasunder cultivation where the seeds have been planted but the plants havenot yet emerged. Joint application with the herbicide is preferred. Tothis end, tank mixes or readymixes can be employed.

The application rates of safener required may vary within wide limitsdepending on the indication and the herbicidally active substance usedand are generally in the range of from 0.001 to 5 kg, preferably 0.005to 0.5 kg, of active substance per hectare.

The present invention therefore also provides a method of protectingcrop plants from phytotoxic side effects of herbicides of the formula(I), which comprises applying an antidote-active amount of a compound ofthe formula (II), (III), (IV), (V), (VI), (VII) and/or from group (b) tothe plants, the seeds of the plants or the area under cultivation,before, after or simultaneously with the herbicidally active substance Aof the formula (I).

The herbicide/safener combination according to the invention may also beemployed for controlling weed plants in crops of genetically engineeredplants which are either known or still to be developed. As a rule, thetransgenic plants are distinguished by particular, advantageousproperties, for example by resistances to certain crop protectionagents, resistances to plant diseases or pathogens causing plantdiseases such as particular insects or microorganisms such as fungi,bacteria or viruses. Other particular properties relate, for example, tothe harvested material in terms of quantity, quality, storingproperties, composition and specific constituents. Thus, transgenicplants are known which have an increased starch content or an alteredstarch quality, or those where the harvested material has a differentfatty acid composition.

The use of the combinations according to the invention is preferred ineconomically important transgenic crops of useful plants andornamentals, for example cereals such as wheat, barley, rye, oats,millet, rice, cassaya and corn or else crops of sugar beet, cotton,soya, oilseed rape, potatoes, tomatoes, peas and other types ofvegetables.

When the combinations according to the invention are employed intransgenic crops, effects on weed plants to be observed in other cropsare frequently accompanied by effects which are specific for applicationin the transgenic crop in question, for example an altered orspecifically widened weed spectrum which can be controlled, alteredapplication rates which may be used, preferably good compatibility withthe herbicides to which the transgenic crop is resistant, and alteredgrowth and yield of the transgenic crop plants.

The invention therefore also provides for the use of the combinationaccording to the invention for controlling weed plants in transgeniccrop plants.

The safeners of the formulae (III)-(VII) and of group (b) and theircombinations with one or more of the abovementioned herbicidally activesubstances of the formula (I) can be formulated in various ways,depending on the biological and/or chemico-physical parametersspecified. Examples of suitable formulations which are possible are:wettable powders (WP), emulsifiable concentrates (EC), water-solublepowders (SP), water-soluble concentrates (SL), concentrated emulsions(BW) such as oil-in-water and water-in-oil emulsions, sprayablesolutions or emulsions, capsule suspensions (CS), oil- or water-baseddispersions (SC), suspoemulsions, suspension concentrates, dusts (DP),oil-miscible solutions (OL), seed dressing products, granules (GR) inthe form of microgranules, spray granules, coated granules andadsorption granules, granules for soil application or broadcasting,water-soluble granules (SG), water-dispersible granules (WG), ULVformulations, microcapsules and waxes.

These individual formulation types are known in principle and described,for example, in: Winnacker-Küchler, “Chemische Technologie” [ChemicalEngineering], Volume 7, C. Hauser Verlag Munich, 4^(th) Edition 1986;Wade van Valkenburg, “Pesticide Formulations”, Marcel Dekker N.Y., 1973;K. Martens, “Spray Drying Handbook”, 3^(rd) Ed. 1979, G. Goodwin Ltd.London.

The formulation auxiliaries which may be required, such as inertmaterials, surfactants, solvents and other additives are also known anddescribed, for example, in: Watkins, “Handbook of Insecticide DustDiluents and Carriers”, 2^(nd) Ed., Darland Books, Caldwell N.J., H.v.Olphen, “Introduction to Clay Colloid Chemistry”, 2^(nd) Ed., J. Wiley &Sons, N.Y.; C. Marsden, “Solvents Guide”, 2^(nd) Ed., Interscience, N.Y.1963; McCutcheon's “Detergents and Emulsifiers Annual”, MC Publ. Corp.,Ridgewood N.J.; Sisley and Wood, “Encyclopedia of Surface ActiveAgents”, Chem. Publ. Co. Inc., N.Y. 1964; Schönfeldt,“Grenzflächenaktive Äthylenoxidaddukte” [Surface-active Ethylene OxideAdducts], Wiss. Verlagsgesell., Stuttgart 1976; Winnacker-Küchler,“Chemische Technologie” [Chemical Engineering], Volume 7, C. HauserVerlag Munich, 4^(th) Edition 1986.

Based on these formulations, it is also possible to prepare combinationswith other substances which act as crop protection agents, such asinsecticides, acaricides, herbicides, fungicides, and also withsafeners, fertilizers and/or growth regulators, for example in the formof a readymix or as a tank mix.

Wettable powders are preparations which are uniformly dispersible inwater and which, besides the active substance, also comprise ionicand/or nonionic surfactants (wetting agents, dispersants), for examplepolyoxyethylated alkylphenols, polyoxyethylated fatty alcohols,polyoxyethylated fatty amines, fatty alcohol polyglycol ether sulfates,alkanesulfonates, alkylbenzenesulfonates, sodium lignosulfonate, sodium2,2′-dinaphthylmethane-6,6′-disulfonate, sodiumdibutylnaphthalenesulfonate, or else sodium oleoylmethyltaurinate, inaddition to a diluent or inert substance. To prepare the wettablepowders, the herbicidally active substances are ground finely, forexample in customary apparatus such as hammer mills, blower mills andair-jet mills, and they are simultaneously or subsequently mixed withthe formulation auxiliaries.

Emulsifiable concentrates are prepared, for example, by dissolving theactive substance in an organic solvent such as butanol, cyclohexanone,DMF, or else higher-boiling hydrocarbons such as saturated orunsaturated aliphatics or alicycles, aromatics or mixtures of theorganic solvents with the addition of one or more ionic and/or nonionicsurfactants (emulsifiers). Examples of substances which can be used asemulsifiers are: calcium alkylarylsulfonates such as calciumdodecylbenzenesulfonate, or nonionic emulsifiers such as fatty acidpolyglycol esters, alkylarylpolyglycol ethers, fatty alcohol polyglycolethers, propylene oxide/ethylene oxide condensates, alkyl polyethers,sorbitan esters, such as sorbitan fatty acid esters or polyoxyethylenesorbitan esters such as polyoxyethylene sorbitan fatty acid esters.Dusts are generally obtained by grinding the active substance withfinely divided solid substances, for example talc, natural clays such askaolin, bentonite and pyrophyllite, or diatomaceous earth.

Suspension concentrates can be water- or oil-based. They can beprepared, for example, by wet-grinding using commercially available beadmills with or without addition of surfactants, for example those whichhave already been mentioned above in the case of the other formulationtypes.

Emulsions, for example oil-in-water emulsions (EW), can be prepared, forexample, by means of stirrers, colloid mills and/or static mixers usingaqueous organic solvents in the presence or absence of surfactants whichhave already been mentioned above, for example, in the case of the otherformulation types.

Granules can be prepared either by spraying the active substance ontoadsorptive, granulated inert material or by applying active substanceconcentrates to the surface of carriers such as sand, kaolinites orgranulated inert material with the aid of binders, for example polyvinylalcohol, sodium polyacrylate or else mineral oils. Suitable activesubstances can also be granulated in the manner which is conventionalfor the preparation of fertilizer granules, if desired as a mixture withfertilizers. As a rule, water-dispersible granules are prepared by thecustomary processes such as spray-drying, fluidized-bed granulation,disk granulation, mixing with high-speed mixers and extrusion withoutsolid inert material.

For the preparation of disk, fluidized-bed, extruder and spray granulessee, for example, “Spray-Drying Handbook” 3^(rd) ed. 1979, G. GoodwinLtd., London; J. E. Browning, “Agglomeration”, Chemical and Engineering1967, pages 147 et seq.; “Perry's Chemical Engineer's Handbook”, 5^(th)Ed., McGraw-Hill, New York 1973, p. 8-57.

For further details on the formulation of crop protection products see,for example, G. C. Klingman, “Weed Control as a Science”, John Wiley andSons, Inc., New York, 1961, pages 81-96 and J. D. Freyer, S. A. Evans,“Weed Control Handbook”, 5^(th) Ed., Blackwell Scientific Publications,Oxford, 1968, pages 101-103.

As a rule, the agrochemical formulations comprise 0.1 to 99% by weight,in particular 0.1 to 95% by weight, of active substances of the formulae(II)-(VII) and/or (b) or of the herbicide/antidote mixture of activesubstances (I) and (II)-(VII) and/or (b) and 1 to 99.9% by weight, inparticular 5 to 99.8% by weight, of a solid or liquid additive and 0 to25% by weight, in particular 0.1 to 25% by weight, of a surfactant.

In wettable powders, the active substance concentration is, for example,approximately 10 to 90% by weight, the remainder to 100% by weight beingcomposed of customary formulation components. In the case ofemulsifiable concentrates, the active substance concentration isapproximately 1 to 80% by weight. Formulations in the form of dustscomprise approximately 1 to 20% by weight of active substances,sprayable solutions approximately 0.2 to 20% by weight of activesubstances. In the case of granules such as water-dispersible granules,the active substance content depends partly on whether the activecompound is in liquid or solid form. The active substance content of thewater-dispersible granules is, as a rule, between 10 and 90% by weight.

Besides this, the abovementioned formulations of active substancescomprise, if appropriate, the adhesives, wetters, dispersants,emulsifiers, penetrants, preservatives, antifreeze agents, solvents,fillers, carriers, colorants, antifoams, evaporation inhibitors and pHand viscosity regulators which are customary in each case.

Co-components which can be used for the mixtures of herbicides andsafeners according to the invention in mixed formulations or in a tankmix are, for example, known active substances as they are described, forexample, in Weed Research 26, 441-445 (1986), or “The Pesticide Manual”,10^(th) edition, The British Crop Protection Council, 1994, and in theliterature cited therein. Herbicides which are known from the literatureand which can be combined with the mixtures according to the inventionare, for example, the following active substances (note: either thecommon names in accordance with the International Organization forStandardization (ISO) or the chemical names, if appropriate togetherwith the customary code number, of the compounds are given):

acetochlor; acifluorfen; aclonifen; AKH 7088, i.e.[[[1-[5-[2-chloro-4-(trifluoromethyl)-phenoxy]-2-nitrophenyl]-2-methoxyethylidene]amino]oxy]aceticacid and its methyl ester; alachlor; alloxydim; ametryn; amidosulfuron;amitrol; AMS, i.e. ammonium sulfamate; anilofos; asulam; atrazin;azafenidine (DPX-R6447), azimsulfuron (DPX-A8947); aziprotryn; barban;BAS 516H, i.e. 5-fluoro-2-phenyl-4H-3,1-benzoxazin-4-one; benazolin;benfluralin; benfuresate; bensulfuron-methyl; bensulide; bentazone;benzofluor; benzoylprop-ethyl; benzthiazuron; bialaphos; bifenox;bispyribac-sodium (KIH-2023), bromacil; bromobutide; bromofenoxim;bromoxynil; bromuron; buminafos; busoxinone; butachlor; butamifos;butenachlor; buthidazole; butralin; butroxydim (ICI-0500), butylate;cafenstrole (CH-900); carbetamide; cafentrazone; CDM, i.e.2-chloro-N,N-di-2-propenylacetamide; CDEC, i.e. 2-chloroallyldiethyldithiocarbamate; chlomethoxyfen; chloramben; chloransulam-methyl(XDE-565), chlorazifop-butyl, chlorbromuron; chlorbufam; chlorfenac;chlorflurecol-methyl; chloridazon; chlorimuron-ethyl; chlornitrofen;chlorotoluron; chloroxuron; chlorpropham; chlorsulfuron;chlorthal-dimethyl; chlorthiamid; cinidon-ethyl, cinmethylin;cinosulfuron; clefoxydim, clethodim; clodinafop and its esterderivatives (for example clodinafop-propargyl); clomazone; clomeprop;cloproxydim; clopyralid; cumyluron (JC 940); cyanazine; cycloate;cyclosulfamuron (AC 014); cycloxydim; cycluron; cyhalofop and its esterderivatives (for example butyl ester, DEH-112); cyperquat; cyprazine;cyprazole; 2,4-DB; dalapon; desmedipham; desmetryn; di-allate; dicamba;dichlobenil; dichlorprop; diclofop and its esters such asdiclofop-methyl; diclosulam (XDE-564), diethatyl; difenoxuron;difenzoquat; diflufenican; diflufenzopyr-sodium (SAN-835H), dimefuron;dimethachlor; dimethametryn; dimethenamid (SAN-582H); dimethazone,methyl5-(4,6-dimethylpyrimidin-2-yl-carbamoylsulfamoyl)-1-(2-pyridyl)-pyrazole-4-carboxylate(NC-330); clomazon; dimethipin; dimetrasulfuron, dinitramine; dinoseb;dinoterb; diphenamid; dipropetryn; diquat; dithiopyr; diuron; DNOC;eglinazine-ethyl; EL 177, i.e.5-Cyano-1-(1,1-dimethylethyl)-N-methyl-1H-pyrazole-4-carboxamide;endothal; epoprodan (MK-243), EPTC; esprocarb; ethalfluralin;ethametsulfuron-methyl; ethidimuron; ethiozin; ethofumesate; F5231, i.e.N-[2-chloro-4-fluoro-5-[4-(3-fluoropropyl)-4,5-dihydro-5-oxo-1H-tetrazol-1-yl]phenyl]ethanesulfonamide;ethoxyfen and its ester (for example ethyl ester, HN-252);ethoxysulfuron (from EP 342569); etobenzanid (HW 52);3-(4-ethoxy-6-ethyl-1,3,5-triazin-2-yl)-1-(2,3-dihydro-1,1-dioxo-2-methylbenzo[b]thiophene-7-sulfonyl)urea(EP-A 079 683);3-(4-ethyl-6-methoxy-1,3,5-triazin-2-yl)-1-(2,3-dihydro-1,1-dioxo-2-methylbenzo[b]thiophene-7-sulfonyl)urea(EP-A 079 683); fenoprop; fenoxan, fenoxaprop and fenoxaprop-P and theiresters, for example fenoxaprop-P-ethyl and fenoxaprop-ethyl; fenoxydim;fentrazamide (NBA-061); fenuron; flamprop-methyl; flazasulfuron;flufenacet (BAY-FOE-5043), fluazifop and fluazifop-P, florasulam(DE-570) and their esters, for example fluazifop-butyl andfluazifop-P-butyl; fluazolate (Mon-48500), fluchloralin;flucarbazone-sodium; flumetsulam; flumeturon; flumiclorac and its esters(for example pentyl ester, S-23031); flumioxazin (S-482); flumipropyn;flupoxam (KNW-739); fluorodifen; fluoroglycofen-ethyl; flupropacil(UBIC-4243); sodium flupyrsulfuron-methyl (DPX-KE459), fluridone;flurochloridone; fluroxypyr; flurtamone; fluthiacet-methyl (K1H-9201),fomesafen; fosamine; furyloxyfen; glufosinate; glyphosate; halosafen;halosulfuron and its esters (for example methyl ester, NC-319);haloxyfop and its esters; haloxyfop-P (═R-haloxyfop) and its esters;hexazinone; imazamethabenz-methyl; imazamox (AC-299263), imazapyr;imazaquin and salts such as the ammonium salt; imazethamethapyr;imazethapyr; imazosulfuron; iodosulfuron (methyl4-iodo-2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)ureidosulfonyl]benzoate,sodium salt, WO 92/13845); ioxynil; isocarbamid; isopropalin;isoproturon; isouron; isoxaben; isoxapyrifop; karbutilate; lactofen;lenacil; linuron; MCPA; MCPB; mecoprop; mefenacet; mefluidid;metamitron; metazachlor; methabenzthiazuron; metham; methazole;methoxyphenone; methyldymron; metabenzuron, methyl2-[3-(4,6-dimethoxypyrimidin-2-yl)ureidosulfonyl]-4-methanesulfonamidomethylbenzoate(WO 95/10507); methobenzuron; metobromuron; metolachlor; S-metolachlor,metosulam (XRD 511); metoxuron; metribuzin; metsulfuron-methyl; MH;molinate; monalide; monocarbamide dihydrogensulfate; monolinuron;monuron; MT 128, i.e.6-chloro-N-(3-chloro-2-propenyl)-5-methyl-N-phenyl-3-pyridazinamine; MT5950, i.e. N-[3-chloro-4-(1-methylethyl)phenyl]-2-methylpentanamide;N,N-dimethyl-2-[3-(4,6-dimethoxypyrimidin-2-yl)ureidosulfonyl]-4-formylaminobenzamide(WO 95/01344); naproanilide; napropamide; naptalam; NC 310, i.e.4-(2,4-dichlorobenzoyl)-1-methyl-5-benzyloxypyrazole; neburon;nicosulfuron; nipyraclofen; nitralin; nitrofen; nitrofluorfen;norflurazon; orbencarb; oryzalin; oxadiargyl (RP-020630); oxadiazon;oxaziclomefone (MY-100), oxyfluorfen; oxasulfuron (CGA-277476),paraquat; pebulate; pendimethalin; pentoxazone (KPP-314), perfluidone;phenisopham; phenmedipham; picloram; piperophos; piributicarb;pirifenop-butyl; pretilachlor; primisulfuron-methyl;pracarbazone-sodium; procyazine; prodiamine; profluralin;proglinazine-ethyl; prometon; prometryn; propachlor; propanil;propaquizafop and its esters; propazine; propham; propisochlor;propyzamide; prosulfalin; prosulfocarb; prosulfuron (CGA-152005);prynachlor; pyraflufen-ethyl (ET-751), pyrazon; pyrazosulfuron-ethyl;pyrazoxyfen; pyribenzoxim, pyridafol; pyridate; pyriminobac-methyl(KIH-6127), pyrithiobac (KIH-2031); pyroxofop and its esters (forexample propargyl ester); quinclorac; quinmerac; quinofop and its esterderivatives, quizalofop and quizalofop-P and their ester derivatives,for example quizalofop-ethyl; quizalofop-P-tefuryl and -ethyl;renriduron; rimsulfuron (DPX-E 9636); S 275, i.e.2-[4-chloro-2-fluoro-5-(2-propynyloxy)-phenyl]-4,5,6,7-tetrahydro-2H-indazole; secbumeton; sethoxydim; siduron; simazine; simetryn; SN106279, i.e.2-[[7-[2-chloro-4-(trifluoromethyl)phenoxy]-2-naphthalenyl]oxy]propanoicacid and its methyl ester; sulfentrazon (FMC-97285, F-6285); sulfazuron;sulfometuron-methyl; sulfosate (ICI-A0224); sulfosulfuron (MON-37500),TCA; tebutam (GCP-5544); tebuthiuron; tepraloxydim (BAS-620H), terbacil;terbucarb; terbuchlor; terbumeton; terbuthylazine; terbutryn; TFH 450,i.e.N,N-diethyl-3-[(2-ethyl-6-methylphenyl)sulfonyl]-1H-1,2,4-triazole-1-carboxamide;thenylchlor (NSK-850); thiazafluron; thiazopyr (Mon-13200); thidiazimin(SN-124085); thifensulfuron-methyl; thiobencarb; thiocarbazil;tralkoxydim; tri-allate; triasulfuron; triaziflam (DH-1105);triazofenamide; tribenuron-methyl; triclopyr; tridiphane; trietazine;trifluralin; triflusulfuron and esters (for example methyl ester,DPX-66037); trimeturon; tsitodef; vernolate; WL 110547, i.e.5-phenoxy-1-[3-(trifluoromethyl)phenyl]-1H-tetrazole; UBH-509; D-489; LS82-556; KPP-300; KPP-421, MT-146, NC-324; KH-218; DPX-N8189; DOWCO-535;DK-8910; V-53482; PP-600; MBH-001.

For use, the formulations which are in commercially available form are,if desired, diluted in the customary manner, for example using water inthe case of wettable powders, emulsifiable concentrates, dispersions andwater-dispersible granules. Preparations in the form of dusts, soilgranules, granules for broadcasting and sprayable solutions are usuallynot diluted any further with other inert substances prior to use.

The necessary application rate of the herbicides of the formula (I)varies with the external conditions such as, inter alia, temperature,humidity, and the nature of the herbicide used. It may be varied withinwide limits, for example between 0.001 and 10.0 kg/ha or more of activesubstance, but it is preferably between 0.005 and 5 kg/ha.

The examples which follow serve to illustrate the invention:

A. Formulation Examples

-   a) A dust is obtained by mixing 10 parts by weight of a compound of    the formula (II)-(VII) and/or from group (b) or of an active    substance mixture of a herbicidally active substance of the    formula (I) and a safener of the formula (II)-(VII) and/or from    group (b) and 90 parts by weight of talc as inert substance and    comminuting the mixture in a hammer mill.-   b) A wettable powder which is readily dispersible in water is    obtained by mixing 25 parts by weight of a compound of the formula    (II), (III), (IV) and/or from group (b) or of an active substance    mixture of a herbicidally active substance of the formula (I) and a    safener of the formula (II), (III), (IV) and/or from group (b), 64    parts by weight of kaolin-containing quartz as inert substance, 10    parts by weight of potassium lignosulfonate and 1 part by weight of    sodium oleoylmethyltaurinate as wetter and dispersant, and grinding    the mixture in a pinned-disk mill.-   c) A dispersion concentrate which is readily dispersible in water is    obtained by mixing 20 parts by weight of a compound of the formula    (II)-(VII) and/or from group (b) or of an active substance mixture    of a herbicidally active substance of the formula (I) and a safener    of the formula (II)-(VII) and/or from group (b), 6 parts by weight    of alkylphenol polyglycol ether (®Triton X 207), 3 parts by weight    of isotridecanol polyglycol ether (8 EO) and 71 parts by weight of    paraffinic mineral oil (boiling range, for example, approx. 255 to    above 277° C.) and grinding the mixture in a ball mill to a fineness    of below 5 microns.-   d) An emulsifiable concentrate is obtained from 15 parts by weight    of a compound of the formula (II)-(VII) and/or from group (b) or of    an active substance mixture of a herbicidally active substance of    the formula (I) and a safener of the formula (II)-(VII) and/or from    group (b), 75 parts by weight of cyclohexanone as solvent and 10    parts by weight of ethoxylated nonylphenol as emulsifier.

e) Water-dispersible granules are obtained by mixing 75 parts by weightof a compound of the formula (II)-(VII) and/or from group (b) or of anactive substance mixture of a herbicidally active substance of theformula (I) and a safener of the formula (II)-(VII) and/or from group(b) 10 parts by weight of calcium lignosulfonate,  5 parts by weight ofsodium lauryl sulfate,  3 parts by weight of polyvinyl alcohol and  7parts by weight of kaolin, grinding the mixture on a pinned-disk milland granulating the powder in a fluidized bed by spraying on water asgranulation liquid. f) Water-dispersible granules are also obtained byhomogenizing and precomminuting, in a colloid mill, 25 part(s) by weightof a compound of the formula (II)-(VII) and/or from groups (b) or of anactive substance mixture of a herbicidally active substance of theformula (I) and a safener of the formula (II)-(VII) and/or from group(b)  5 part(s) by weight of sodium 2,2′-dinaphthylmethane-6,6′-disulfonate  2 part(s) by weight of sodium oleoylmethyltaurinate,  1part(s) by weight of polyvinyl alcohol, 17 part(s) by weight of calciumcarbonate and 50 part(s) by weight of water, subsequently grinding themixture on a bead mill and atomizing and drying the resulting suspensionin a spray tower by means of a single-substance nozzle.

BIOLOGICAL EXAMPLES

1. Damage Scoring

The damage to the plants is evaluated visually in comparison withcontrol plants, according to a scale from 0-100%:

-   0%=no perceptible action in comparison with the untreated plant,-   100%=treated plant dies.    2. Herbicide Action and Safener Action Preemergence

Seeds of monocotyledonous and dicotyledonous broadleaf weed plants andof crop plants are placed in sandy loam and plastic pots of 9 cm indiameter and are covered with soil. Alternatively, for the test underconditions for paddy rice, broadleaf weeds which occur in rice growingare cultivated in waterlog soil, the amount of water introduced into thepots being such that the water comes up to the soil surface or severalmillimeters above it. The herbicide/safener active substancecombinations of the invention, formulated in the form of emulsifiableconcentrates, and, in parallel trials, the correspondingly formulatedindividual active substances, are then applied to the surface of thecovering earth or, in the case of rice, poured into the irrigation waterin the form of emulsions, at a water application rate of 300 l/ha(converted), at different concentrations.

Following treatment, the pots are placed in a greenhouse and are keptunder good growth conditions. Visual scoring of the plant and/oremergence damage takes place after the trial plants have emerged, aftera trial period of 3-4 weeks, in comparison to untreated controls. As thetrials show, the herbicidal compositions of the invention have a goodpreemergence herbicidal action against a broad spectrum of gramineousand broadleaf weeds, with substantial reduction—that is, from around 50%up to 100% less herbicide damage—in damage to crop plants such as corn,rice, wheat or barley or other cereals in comparison with the use of theindividual herbicides without safeners.

3. Herbicide Action and Safener Action Postemergence

Seeds of monocotyledonous and dicotyledenous broadleaf weed plants andof crop plants are placed in sandy loam and plastic pots, colored withsoil and grown in a greenhouse under good growth conditions.Alternatively, for the test under conditions for paddy rice, broadleafweeds that occur in rice growing, and rice, are cultivated in pots inwhich water stands up to 2 cm above the soil surface, and are cultivatedduring the growth phase. About three weeks after sowing, the trialplants are treated at the three-leaf stage. The herbicide/safener activesubstance combinations of the invention, formulated as emulsifable orconcentrates, and, in parallel trials, the correspondingly formulatedindividual active substances are sprayed on the green parts of theplants at different concentrations with a water application rate of 300l/ha (converted) and, after the trial plants have stood in thegreenhouse for 3 weeks under optimum growth conditions, the action ofthe preparations is scored visually in comparison with untreatedcontrols. In the case of rice or broadleaf weeds which occur in ricegrowing, the active substances are also introduced directly into theirrigation water (application in analogy to granular application, as itis known) or on plants and sprayed into the irrigation water. In thecase of field trials, seeds of monocotyledonous and dicotyledonousbroadleaf weed plants and of crop plants were placed in sandy loam,covered with earth and grown. Further treatment was as described above.Evaluation in the case took place two weeks after the treatment withherbicide and/or safener. In the case of the trials with sugar cane,evaluation was carried out after 63 days. The experiments show that theherbicidal compositions of the invention exhibit a good postemergenceherbicidal action against a broad spectrum of gramineous and broadleafweeds, with substantial reduction—i.e., around 50% up to 100% lessherbicide damage—in damage to crop plants such as sugar cane, corn,rice, wheat or barley or other cereals in comparison with the use of theindividual herbicides without safeners.

Table 1 specifies the herbicides used, and table 2 the safeners. Tables3 to 7 indicate the percentage by which the damage in corn, sugar cane,rice, wheat or barley, respectively, caused by a herbicide is lessenedby simultaneous use of the safener.

TABLE 1 Herbicides No. Structure H1

H2

H3

H4

H5

H6

H7

H8

TABLE 2 Safeners No. Structure S1

S2

S3

S4

S5

S6

S7

S8

S9

S10 

TABLE 3 Postemergence field trials, corn Compound No. Rate [g/ha]Reduction in damage to Herbicide Safener Herbicide Safener corn fromusing safener H1 S1 200 + 200  54% H1 S7 400 + 100  50% H2 S1 100 + 100100% H2 S1 200 + 100  96% H2 S7 80 + 80 100% H2 S8 80 + 80 100% H2 S980 + 80 100% H2 S10 80 + 80 100% H3 S1 150 + 150  84% H4 S1 150 + 150 89% H5 S1 150 + 150 100% H6 S1 150 + 150 100% H7 S1 150 + 150 100% H8S1 150 + 150  83%

TABLE 4 Postemergence field trials, sugar cane Reduction in Compound No.Rate [g/ha] damage to sugar cane Herbicide Safener Herbicide Safenerfrom using safener H2 S1 200 + 200 60%

TABLE 5 Postemergence greenhouse trials, rice Reduction in Compound No.Rate [g/ha] damage to rice Herbicide Safener Herbicide Safener fromusing safener H1 S1 100 + 200 78% H1 S3 120 + 600 68% H2 S2 200 + 60063% H8 S1 200 + 200 71%

TABLE 6 Postemergence greenhouse trials, wheat Reduction in Compound No.Rate [g/ha] damage to wheat Herbicide Safener Herbicide Safener fromusing safener H1 S4 20 + 80 21% H1 S5 20 + 80 29% H2 S4 100 + 100 60% H2S5 20 + 20 71% H2 S5 100 + 100 70% H2 S6 60 + 60 50%

TABLE 7 Postemergence greenhouse trials, barley Reduction in CompoundNo. Rate [g/ha] damage to barley Herbicide Safener Herbicide Safenerfrom using safener H2 S5 180 + 180 100% H2 S5 100 + 100 100% H2 S6 20 +80  75%

In table 8, following the working examples, the seed was first treatedwith safener and, after sowing and emergence, the plant was then treatedwith herbicide. Here again, a marked reduction in the damage caused bythe herbicide is evident in comparison to the seed which was not treatedwith safener. The amount of safener indicated is based on the amount ofseed.

TABLE 8 Postemergence greenhouse trials following seed treatment, cornReduction in Compound No. Rate [g/ha] Rate [g/ha] damage to cornHerbicide Safener Herbicide Safener from using safener H2 S9 80 0.05 87%H2 S3 80 0.1 84% H2 S7 80 0.01 84% H2 S8 80 0.05 87%

1. A herbicidal composition comprising: A) a herbicidally effectiveamount of one or more compounds of the formula (I)

in which the symbols and indices have the following definitions: R¹ isnitro, amino, halogen, cyano, (C₁-C₄)-alkyl, (C₂-C₄)-alkenyl,(C₂-C₄)-alkynyl, (C₁-C₄)-haloalkyl, (C₂-C₄)-haloalkenyl,(C₂-C₄)-haloalkynyl, (C₁-C₄)-haloalkoxy, (C₁-C₄)-haloalkylthio,(C₁-C₄)-alkoxycarbonyl, (C₁-C₄)-alkylsulfonyl, (C₁-C₄)-alkylsulfinyl,(C₁-C₄)-alkylthio, (C₁-C₄)-alkoxy, (C₁-C₄)-alkoxy-(C₁-C₄)-alkoxy,(C₁-C₄)-alkylcarbonyl, (C₁-C₄)-alkylaminosulfonyl,(C₁-C₄)-dialkylaminosulfonyl, (C₁-C₄)-alkylcarbamoyl,(C₁-C₄)-dialkylcarbamoyl, (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl,(C₁-C₄)-alkylamino or (C₁-C₄)-dialkylamino; R² is(C₁-C₄)-haloalkoxy-(C₁-C₄)-alkyl,(C₁-C₄)-alkoxy-(C₁-C₄)-alkoxy-(C₁-C₄)-alkoxy-(C₁-C₄)-alkyl,(C₃-C₆)-cycloalkoxy-(C₁-C₄)-alkyl, (C₃-C₆)-cycloalkyl-(C₁-C₄)-alkoxy,tetrahydrofuran-2-yl-methoxy-(C₁-C₄)-alkyl,tetrahydrofuran-3-yl-methoxy-(C₁-C₄)-alkyl or a heterocyclic radicalfrom the group consisting of isoxazol-3-yl and 4,5-dihydroisoxazol-3-ylwhich is substituted by a radical from the group consisting ofcyanomethyl, ethoxymethyl and methoxymethyl; R³ is OR⁵, cyano, halogen,cyanato, thiocyanato, (C₁-C₄)-alkylthio, (C₁-C₄)-alkylsulfinyl,(C₁-C₄)-alkylsulfonyl, (C₂-C₄)-alkenylthio, (C₂-C₄)-alkenylsulfinyl,(C₂-C₄)-alkenylsulfonyl, (C₂-C₄)-alkynylthio, (C₂-C₄)-alkynylsulfinyl,(C₂-C₄)-alkynylsulfonyl, (C₁-C₄)-haloalkylthio, (C₂-C₄)-haloalkenylthio,(C₂-C₄)-haloalkynylthio, (C₁-C₄)-haloalkylsulfinyl,(C₂-C₄)-haloalkenylsulfinyl, (C₂-C₄)-haloalkynylsulfinyl,(C₁-C₄)-haloalkylsulfonyl, (C₂-C₄)-haloalkenylsulfonyl or(C₂-C₄)-haloalkynylsulfonyl; R⁴ is (C₁-C₄)-alkyl; R⁵ is hydrogen,(C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl or (C₁-C₄)-alkoxy-(C₁-C₄)-alkyl; a is0, 1, 2 or 3; b is 0, 1 or 2; and B) an antidote-active amount of one ormore compounds of the formula

in which the symbols and indices have the following definitions: n′ is anatural number from 1 to 5, W is a radical

m′ is 0 or 1; R¹⁷ is are identical or different and are hydrogen,halogen, (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy, nitro or (C₁-C₄)-haloalkyl; R¹⁸is are identical or different and are OR²⁴, SR²⁴ or NR²⁴R²⁵ or asaturated or unsaturated 3- to 7-membered heterocycle containing atleast one nitrogen atom and up to 3 heteroatoms which is bonded by thenitrogen atom to the carbonyl group in (II) or (III) and isunsubstituted or substituted by radicals from the group consisting of(C₁-C₄)-alkyl, (C₁-C₄)-alkoxy and unsubstituted or substituted phenyl;R²⁴ is hydrogen or an unsubstituted or substituted aliphatic hydrocarbonradical; R²⁵ is hydrogen, (C₁-C₆)-alkyl, (C₁-C₆)-alkoxy or substitutedor unsubstituted phenyl; and R²⁹ is identical or different and arehydrogen, (C₁-C₈)-alkyl, (C₁C₆)-haloalkyl, (C₃-C₁₂)-cycloalkyl orsubstituted or unsubstituted phenyl; inclusive of the stereoisomers andthe agriculturally customary salts.
 2. The herbicidal composition asclaimed in claim 1, comprising compounds of the formula (I) wherein thesymbols and indices have the following definitions: R¹ is nitro, cyano,chlorine, fluorine, methyl, trifluoromethyl, methylsulfonyl orethylsulfonyl; R² is pentafluoroethoxymethyl, 2,2-difluoroethoxymethyl,2,2,2-trifluoroethoxymethyl, 2,2,3,3-tetrafluoropropoxymethyl,cyclopentyloxymethyl, cyclohexyloxymethyl, cyclopropyloxy,tetrahydrofuran-2-ylmethoxymethyl, methoxyethoxyethoxymethyl, or4,5-dihydroisoxazol-3-yl which is substituted by a radical from thegroup consisting of cyanomethyl, ethoxymethyl and methoxymethyl; R³ isOR⁵; R⁵ is hydrogen; a is 2; b is 0, and the two radicals R¹ are inpositions 2 and 4 of the phenyl ring.
 3. The herbicidal composition asclaimed in claim 1, wherein the ratio of herbicide to safener is from1:10 to 10:1.
 4. The herbicidal composition as claimed in claim 1,comprising a further herbicide.
 5. The herbicidal composition as claimedin claim 1 wherein component B is ethyl5,5-diphenyl-2-isoxazoline-3-carboxylate.
 6. The herbicidal compositionas claimed in claim 1 wherein component B is of formula (II) and W isW4, and wherein component A is


7. The herbicidal composition as claimed in claim 1 wherein component Bis ethyl 5,5-diphenyl-2-isoxazoline-3-carboxylate, and wherein componentA is


8. The herbicidal composition as claimed in claim 1, wherein R²⁴ ishydrogen, (C₁-C₈)-alkyl, (C₃-C₁₂)-cycloalkyl, (C₂-C₈)-alkenyl and(C₂-C₁₈)-alkynyl, where the carbon-containing groups can be substitutedby one or more radicals R⁵⁰; R⁵⁰ is identical or different and ishalogen, hydroxyl, (C₁-C₈)-alkoxy, (C₁-C₈)-alkylthio,(C₂-C₈)-alkenylthio, (C₂-C₈)-alkynylthio, (C₂-C₄₈)-alkenyloxy,(C₂-C₈)-alkynyloxy, (C₃-C₇)-cycloalkyl, (C₃-C₇)-cycloalkoxy, cyano,mono- and di-(C₁-C₄)-alkyl)amino, carboxyl, (C₁-C₈)-alkoxycarbonyl,(C₂-C₈)-alkenyloxycarbonyl, (C₁-C₈)-alkylthiocarbonyl,(C₂-C₈)-alkynyloxycarbonyl, (C₁-C₈)-alkylcarbonyl,(C₂-C₈)-alkenylcarbonyl, (C₂-C₈)-alkynylcarbonyl,1-(hydroxyimino)-(C₁-C₆)alkyl, 1-[(C₁-C₄)-alkylimino]-(C₁-C₄)-alkyl,1-[(C₁-C₄)-alkoxyimino]-(C₁-C₆)-alkyl, (C₁-C₈)-alkylcarbonylamino,(C₂-C₈)-alkenylcarbonylanuno, (C₂-C₈)-alkynylcarbonylamino,aminocarbonyl, (C₁-C₈)-alkylaminocarbonyl,di-(C₁-C₆)-alkylaminocarbonyl; (C₂-C₆)-alkenylaninocarbonyl,(C₂-C₆)-alkynylaminocarbonyl, (C₁-C₈)-alkoxycarbonylamino,(C₁-C₈)-alkylaminocarbonylamino, (C₁-C₆)-alkylcarbonyloxy which isunsubstituted or substituted by R⁵¹, or is (C₂-C₆)-alkenylcarbonyloxy,(C₂-C₆)-alkynylcarbonyloxy, (C₁-C₈)-alkylsulfonyl, phenyl,phenyl-(C₁-C₆)-alkoxy, phenyl-(C₁-C₆)alkoxycarbonyl, phenoxy,phenoxy-(C₁-C₆)-alkoxy, phenoxy-(C₁-C₆)alkoxycarbonyl,phenylcarbonyloxy, phenylcarbonylamino,phenyl-(C₁-C₆)alkylcarbonylamino, for the phenyl ring being thelast-mentioned 9 radicals unsubstituted or mono- or polysubstituted byradicals R⁵²; SiR′₃, OSiR′₃, R′₃Si-((C₁-C₈)-alkoxy, —CO—O—NR′₂,—O—N═CR′₂, —N═CR′₂, —O—NR′₂, —NR′₂, —CH(OR′)₂, —O—(CH₂)_(m)—CH(OR′)₂,—CR′″(OR′)₂, —O—(CH₂)_(m)CR′″(OR″)₂ or byR″O—CHR′″CHCOR″—(C₁-C₆)-alkoxy, R⁵¹ is identical or different and ishalogen, nitro, (C₁-C₄)-alkoxy and phenyl which is unsubstituted orsubstituted by one or more radicals R⁵¹, R⁵² is identical or differentand is halogen, (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy, (C₁-C₄)-haloalkyl,(C₁-C₄)-haloalkoxy or nitro; R′ is identical or different and ishydrogen, (C₁-C₄)-alkyl, phenyl which is unsubstituted or substituted byone or more radicals R⁵², or two radicals R′ together form a(C₂-C₆)-alkanediyl chain; R″ is identical or different and is(C₁-C₄)-alkyl, or two radicals R″ together form a (C₂-C₆)-alkanediylchain; R′″ is hydrogen or (C₁-C₄)-alkyl; m is 0, 1, 2, 3, 4, 5 or
 6. 9.The herbicidal composition as claimed in claim 8, wherein R²⁴ ishydrogen, (C₁-C₈)-alkyl or (C₃-C₇)-cycloalkyl, the abovecarbon-containing radicals being unsubstituted or mono- orpolysubstituted by halogen or mono or disubstitutedby radicals R⁵⁰, R⁵⁰is identical or different and is hydroxyl, (C₁-C₄)-alkoxy, carboxyl,(C₁-C₄)-alkoxycarbonyl, (C₂-C₆)-alkenyloxycarbonyl,(C₂-C₆)-alkynyloxycarbonyl, 1-(hydroxyimino)-(C₁-C₄)-alkyl,1-[(C₁-C₄)-alkylimino]-(C₁-C₄)-alkyl and1-[(C₁-C₄)-alkoxyimino]-(C₁-C₄-alkyl; —SiR′₃, —O—N═CR′₂, —N═CR′₂, —NR′₂and ONR′₂ where R′ is identical or different and is hydrogen,(C₁-C₄)-alkyl or, as a pair, a (C₄-C₅)-alkanediyl chain, R²⁹ isidentical or different and are hydrogen, (C₁-C₈)-alkyl,(C₁-C₆)-haloalkyl, (C₃-C₇)-cycloalkyl or phenyl which is unsubstitutedor substituted by one or more radicals selected from the groupconsisting of halogen, cyano, nitro, amino, mono- anddi-[(C₁-C₄-alkyl]amino, (C₁-C₄)-alkyl, (C₁-C₄)-haloalkyl,(C₁-C₄)-alkoxy, (C₁-C₄)-haloalkoxy, (C₁-C₄)-alkylthio and(C₁-C₄)alkylsulfonyl; R¹⁷ is identical or different and are hydrogen,halogen, methyl, ethyl, methoxy, ethoxy, or (C₁ or C₂).
 10. Theherbicidal composition as claimed in claim 1, wherein R¹⁷ is halogen,nitro or (C₁-C₄)-haloalkyl; R¹⁸ is a radical of the formula OR²⁴; R²⁴ ishydrogen, (C₁-C₈)-alkyl or (C₃-C₇)-cycloalkyl, where the abovecarbon-containing radicals are unsubstituted or mono- orpolysubstiftutedby identical or different halogen radicals or up todisubstituted by identical or different radicals selected from the groupconsisting of hydroxyl, (C₁-C₄)-alkoxy, (C₁-C₄)-alkoxycarbonyl,(C₂-C₆)-alkenyloxycarbonyl, (C₂-C₆)-alkynyloxycarbonyl,1-(hydroxyimino)-(C₁-C₄)-alkyl, 1-[(C₁-C₄)-alkylimino]-(C₁-C₄)-alkyl,1-[(C₁-C₄)-alkoxymino]-(C₁-C₄)-alkyl and radicals of the formulae—SiR′₃, —O—N═R′₂, —N═CR′₂, —NR′₂ and —O—NR′₂, where the radicals R′ inthe abovementioned formulae are identical or different and are hydrogen,(C₁-C₄)-alkyl or, as a pair, are (C₄ or C₅)-alkanediyl; R²⁹ is identicalor different and are hydrogen, (C₁-C₈)-alkyl, (C₁-C₆)-haloalkyl,(C₃-C₇)-cycloalkyl or phenyl which is unsubstituted or substituted byone or more of the radicals selected from the group consisting ofhalogen, (C₁-C₄)-alkyl, (C₁-C₄)-alkoxy, nitro, (C₁-C₄)-haloalkyl and(C₁-C₄)-haloalkoxy.
 11. A method of controlling weed plants in cropswhich comprises applying a herbicidally active amount of a herbicidalcomposition as claimed in claim 1 to the weed plants, plants, seeds ofplants, or the area on which the plants are growing.
 12. The method asclaimed in claim 11, wherein the plants are from the group consisting ofsugar cane, corn, wheat, rye, barley, oats, rice, sorghum, cotton, andsoya.
 13. The method as claimed in claim 11, wherein the plants havebeen genetically modified.